Furnace-door.



J. R. HALL.

FURNACE D008.

APPLICATION FILED APR. 4. 1918 1,286,604. Patented m. :3, 1918.

3 SHEETS SHEU lx J. R. HALL.

FURNACE DOOR.

APPLICATION man APR. 4, 191B Patented Dec. 3, 1918.

3 SHEETS- SHEET 2.

a sucnssnzn a.

Patented Dec.

Even/p7",

UNITED STATES PATENT OFFICE.

JULIUS R. HALL, 01 OAK PARK, ILLINOIS, ASSIGNOR TO BOOTH-HALL COMPANY, OF .CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FURNACE-boon.

Specification of Letters Patent.

Patented Dec. 3, 1918.

' Application filed April 4. 1918. Serial No. 226,576.

To all whom it may concern.

Be it known that l. Junws R. HALL, a citizen of the United States, residing at Oak Park, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Furnace-Doors, of which the following is a specification.

This invention relates particularly to doors for electric furnaces.

The primary object is to provide a furnace door equipped with an electrode-holder,

which is durable andwell adapted to its purpose and permits, nmnipulation of the electrode in a desirable manner.

A further objectis to provide an electrio furnace with an electrode-supporting door of the character indicated, which may be termed an auxiliary door, and to provide the furnace with a' main door for the same opening, said doors being mounted to swing out of the path of each other, so that either door may be used to close the door-opening,

It may be stated preliminarily that the construction herein described is particularly desirable in electric furnace construction wherein there is employed anauxiliary electrode adapted to be temporarily used in preliminarily heating the. furnace. that is, in heating the furnace until the bottom or wall-contacts become sufficiently conductive to carry the current, after which the auxiliary electrode may be withdrawn. In the construction illustratech the main door is retracted or moved to an inoperative position and the auxiliary door is motor] to the closed position and-serves to hold the auxiliary electrode in the furnace during the prelin'iinary heating operation, after which the auxiliary door is moved to the inoperative position out of the path of the main door, and'the main door is thereupon closed and 'the operation of the furnace proceeds,

the current now being carried wholly by the m'a1n electrode or'electrmles and the body or wall'contacts or electrodes whirh are rcir dered coiuluctive by the preliminary heat-. ing operation.

The invention is illustrated in its preferred 'enibodiment in the accompanying drawings. in which-' Figure] represents a broken plan view of an electric furnace constriurted in accordance with theinvention; Fig. 2, a broken elevational view. of the same. this vuw, as well as the preceding view. showing the main door in the'inoperative position and the auxiliary door in operative position; Fig. 3, a broken vertical sectional view showing the construction of the auxiliary door. that is. the door carrying the auxiliary electrode; Fig.4, a broken section taken .as indicated at line -l of Fig. 3; Fig. 5, a broken sectional view taken as indicated at line 5 of Fig. 3; and Fig. (5, a plan sectionul view taken as indicated at line 6 of Fig. 5.

In the construction illustrated, A represents the body of the furnace, wall is provided with a door-openin" A; A a ,door-opening-fralue secured to the vertical wall of the furnace-body;Ih a vertically-movable counter-balanced imiin door adapted to close the .(loor-opening- =A and also to be swung tofa position above thedoor whose vertical opening and out-of the path .of-theaauxiliary door;

to be swung to 'a position to one side of the door-opening A and out of the path of the main doom-(1', an 'electrode-sllpportbig frame mounted on the auxiliary door an electrode-holder or'claulp .inovubly mounted on the frame 3'. on which frame the member (l is adapted to travel andtilt;

and C, an electrode carried by theolaiup C and adapted toexteud through an openi 1,: 5 be. provided with one or more'ntain electrode jdepemlmg i through the-doineof, the; furnacmf p, ;lustrated in said patenhland'tlie' auxiliary electrode herein illustratedmay be used in'aecordance with the invention disclosed in said patent, that is, tlie.a uX-iliary' electrode h'ere-' -ty as the \i'all-c( )ntuct (mit-"showm whit-basemployed in the bottom of the ifurnace." The (1,, an auxiliary. door: adapted ing in the door The -fl|rnace-body- A may befof an able construction. It is-usnal to *so mount the furnace-body that it cunbe tilted his feature is not illustrated, as" 't for" no part of the presentinvention:.:' j V The fnrnace may be provided n-1 s bot-.1

main ele'ctrode,-- or anain clcc'trmies whic'hf depend througlrthe top walllof the'fui'nace,

may be mounted in any suitable.manner. They may be'mounted, for instance, in the manner illustrated in, my co-pending application No. 220.702, filed March 6, 1918.

The furnace-body A comprises preferably a steel shell 1 and a refractory lining 2 through which the door-openin A extends. The door-frame A may he of any suitable construction. In the form shown it comprises a cast-metal annulus 3 and a detachable insert-plate 4 at the upperportion of said annulus, adapted to be replaced by a new insert plate, according to necessitv.

construction. In the construction illustrated. the door B is adapted to be carried from the closed to the open position shown,

' perforations and a loop or guide 11 provided with a corresponding perforation and adapted to receive a pm 12 may serve to -hold the main door temporarily in elevated position and out of the path of the auxiliary door. a

The door'C preferably comprises a casting having a water-coolml portion '13 .which is adapted to extend into the door-opening. the door thus having a water-chamber 14 with which communicate flexible pipes 14. pro viding for water circulation. The door C IS provided at its upper edge portion with a deep recess 15 which has an inclined bottom 7 wall 15*;"upon which the. inclined auxiliary electrode-'0" may rest. The door C is, in the illustration gircn. equipped with arms 16 which may be cast. integrally with thedoor. These arm's extend to a point distant from one lateral edge of the door-opening and have their extremities equi )pttlWltll a sleeve or pivot portion 1t$','whic may be cast integrally with the arms, TlllS sleeve is fixedlysecureditc a vertical-pintlc' or shaft 17 which is minmted iii-bearings 18 secured to l has its inner endcquipped with lugs 2U tie-- the shell of the furnace-body. The sleeve 16 is rigidly secured to the shaft 1?; as by means of a set-screw 19.

which really constitutes an incline extension of the auxiliary door C,- preferably comprises a. casting 20g'which is'provided with inclined guide flanges 20", and which tachably seciired to the arms 16 which are extended across the outer face of the door C, withwhich said arms 16am integrally The main door B may be of any suitable formed; an inclined rack 20? disposed between the guide flanges 20 and secured to the upper wall of the casting 20; and a air of hooks 20 secured-to the outer end of t 1e castmg 20 and adapted to serve as pivotal supports for the electrode-clamp (3 to enable the electrode to'be tilted'to a vertical position with its inner or hot end elevated, after the electrode is-withdrawn from theiurnace.

The electrode-holder or clamp C c0m prises aslide22 adapted to the guide flanges 20", and a split clamping-ring 22 through which the electrode C extends and is adjustable. The slide 22 is provided beneath the electrode with a transverse bearing 22? in which is journaleda shaft 23 which 'is "equipped with a pinion 23' which meshes with the rack 20. One end of the shaft 23 is equipped with an a'ctua-tin wheel 23". The slide 22 is'equi pad with a aterally-projectin arm 24, wit which is securely connected a exible conductor 24', which may comprise a laminated eoppe'rband.

The conductor 24" depends from the arm 24. as shown in Fig.4, and extends to a considerable distance below the level of the door C,"as will be understood from Fig.

a. It is then bent forwardly to form a loop 24 (Figs. 5 and 6) and is then bent upwardly as indicatediat 24. 'The extremity 24 is connected with an arm 25 of a switch which has a sleeve portion 255- firm1y securedtoai downward BXtBIlSlQH'fOf the shaft 17 the sleeve 25'being also equipped with a knifea rm 25* which works between the furcations 26 of a connection 27 which is secured to. the shell of the furnace thus placing the auxiliary electrode C in electrical connection with said shell and thus with the wall-contact or contacts (not shown) with which the furnace'body is v equipped. It. will be understood that the loop 24" of the conductor24 is of sufiici'ent dimensions to compensate. for the movement of the electrode holder C on its guides. From Figs. '5 and 6 it will be understood that when the inn-- iary door 0 is swung to the open position the switch secured to the pivot-shaftl? will be disconnected, so that the auxiliary electrode will be thrown out ofthe electric cir- 1 cult. l i

,It will be noted, from Fig. 3, thatthe guide-flanges 20. are discontinued at the points 20". The hooks'20" are open toward the electrode-liolder 0, and are adapted to me receive the. shaft 23. when the slide 22 is moved to the up er, outer end oiitstraverse. iVhen this occurs, the slide becomes discon nected from the gnide-tlanges 20', and the operator, by depressing theouter end, of the 12 5 e ectrode, ma swi the electrode to the vertical position in looted by dotted 'lines iii-Fig. -3, in which position. it, may be secured by means of a book 28. which is pivotally connected with the outer-end of the cast- 13aing 20 and which is adapted to engage a perforate lug 28 with which the slide 22 is equipped. V

'I he manner of use will be readily understood from the description given. To 'prepare the furnace for operation. the charge is introduced through the door A, while the main door 13 is in the elevated position and the auxiliary door C is in a position at one lateral side of the door-opening. lVhen the furnace is to be set in operation, the auxiliary electrode-holder is swung from the dotted position shown in Fig. 3 to a position parallel with the full-line position shown in Fig. 3; and by means of the hand-wheel 23" the pinion :23 is caused to operate on the arm 2-1 and shift the electrode-holder C to the position shown in full lines in Fig. 3. In this movement, the shaft '23 moves out of the hooks 20 and the slide 22 passes on to the guides 20, so that when the electrodeholder C in the operative position it .will

be firmly held on the guides. The auxiliary electrode-holder C is then adjusted in the holder C until its inner end comes-in contact with the charge in the furnace. In the operation of swinging the door C to the c osed position, the switch comprising the arms 25 and 25" is thrown to the connecting position, thereby throwing theelectrode C into circuit with the wall-contact, or wallcontacts, of the furnace. In the operation, the current will pass from the main elecdome of the furnace to the auxiliai trode C, it being understood that in this operation the main electrode or electrodes are so adjusted as to afford arcs between their lower ends and the charge, so that the metal or material will be fused and form a pool at the bottom'of the furnaoefthus heating the.

lining of the furnace until the refractor facings of the wall-contacts become still-e ciently heated reconstitute good conductors, whereupon the current will be divided between the wall-contacts and the auxiliary 1 electrode, which are of the same polarity.

\Vhen 'the wall-contacts become operative, the auxiliary electrode C may be withdrawn and swung to the'vertical position shown in dotted lines in Fig. 3, after which the auxil lary door may be swung to the inoperative position atone lateral side of the door-opening. The mam. door may then be lowered from the upper side of the door-opening to" the closing position. In this closing movement. the. main door B slides across the frame A of the door-opening, and is firmly wedged between the intermediate portion of l'llt" \0l 7 and the frame A and by u'cason of the fact that the door B is pivotally suspended on the yoke, it will adjust itself to the outer surface of the frame A of the door-opening, against. which it ,is in effect wedged, affording a close joint. The operaopening A; thatthe doors swing clear of each other to enable either door to be moved to the operative position; that the auxiliary door serves as a part of the supporting means for the auxiliary electrode, and is pro- ,rided with connections for water circulation.

regardless of the position of the auxiliary door; that the circuit for the auxiliary electrode is automatically made in the operation of swinging the tlUXllltlIV door to the closed position and is broken in the operation of swinging the auxiliary door to the inoperw.

tire posltion; and that the electrode-clam p is shiftably and tiltably mounted on its sup porting frame, so that after withdrawal of the electrode it may be swung to the vertical position with the heated end of the electrode uppermost.

The foregoing detailed description has been given for'clearness of understanding only, and no unnecessary limitation should be understood therefrom, but the appended claims should be considered as broadly as permissible in view of the prior art.

What I regard as new and desireto secure by Letters Patent is-- 1. In means of the character set forth, the combination of a furnace-wall provided with a door-opening, and a door adapted to said opening equipped with electrode-supporting means. i

'2. In means of the character set, fortln the combination with a furnace-wall provided with n door-opening, ,of a door adapted to said opening and mounted to be moved to a position away from said opening, and an electrode-holder movably mounted on said door,

3. In means of the character set forth. the combination with a furnace-null provided with a door-opening. of a door adapted to said opening and lnouiitedto be moved to a position away. from-said opening, and an electrode -hillder shiftably and tiltably mounted onsaid door.

coinbination with a furnace-wall provided Ila.

with adoor-open'ing, of a door adapted to said opening and mounted to be swung to a position away from the opening, an extension on said door, equipped with a guide. a slide mounted on said guide and equipped with electrode-clamping means, and means for moving said slideon said guide. 5. i means of the character set forth. the combination with a furnace-Wall provided with a door-opening, of a door adapted to said opening and mounted to b swung to a position away from said opening. an extension on said door equipped with a guide. a slide mounted on said guide and equipped with electrode-clamping means, and rack and pinion means adapted to move said slide on said guide.

(i. In means of the character set forth. the combination with a fnrnaceqvall provided with a door-opening. of a door adapted to said opening and mounted to be moved to a position away from said opening. a shiftable elcctrotle'holder carried by said door, and means whereby said electrode-holder may be shifted and tilted.

7. in means of the character set forth, the combination with a furnace-wall provided with a door-opening, of a door adapted to said opening and'mounted to permit it to be moved to a position away from the dooropening, a guide extending outwardlyfrom said door, a slide adapted to move on said guide and to be disconnected therefrom, said slide being equipped with electrode-holding means, and means whereby said slide may be tilted to swing the electrode to an upright position. a

8. In means of the character set forth, the combination with a furnacerwall provided with a door-opening, of a door adapted to said opening and mounted to be moved'to a position away from the opening, an electrode mounted on said door, and electric connec-' tions for said electrode, including a switch actuated in the opening and closing movements of said door.

9. In means of the character setwforth, the

combination with a furnace-wall provided" with a. door-opening, of a door-adapted to 4' said opening and mounted to be moved'to .a

position removed from the opening, an electrode-holder movably mounted on said door, a switch having a member 'adapted'to be actuated in the opening and closing ofisaid door, and a flexible conductor between said electrmle-holder and said switch.

'10. In means of the. ohnracterset forth, the combination with a furnace-wall provided with a door-opening, of a door adapted to said opening and mounted to be swung to a position away from the dooropenin a guide projecting outwardly from-said oor, an electrmle-holder shiftnbly mounted on said guide, and means at the outer end. of said guide for pivotally supporting said tltt'iI'UtlWllUltlPl. v i

1 1. I n means-of the character set forth, the combination with a' fin'nnee-wall provided with a door-opening, of a door adapted to said opening and mounted to be swung to a position away from the door-openin a guide projecting outwardly from said oor, an electrodo-hOlder shiftably moiinted on said guide, means at the outer end of said 12. In means of the character set forth the combination with a furnace-walldprovlded with a door-opening, of a door a opted to said opening and mounted to be swung to a position removed from the opening, an extension carried by said door and provided with a guide and rack and equipped also with hooks an electrode-holder mounted on said guide an adapted to be disconnected therefrom at the outer end of the traverse, and a shaft journaled in said slide and equipped with a pinion working in said rack, said shaft adapted to engage said hooks and serve as a pivot for the electrode-holder.

13. In means of the character set forth the combination with a furnace-wall provided with a door-opening, of a, door adapted to said opening and mounted to be swung to a position removed from the opening, an extension carried b said door and provided with a guide on rack and equippedalso with hooks, an electrode-holder mounted on said guide and adapted to be disconnected therefrom at the outer end of the traverse, a shaft journaled in said electrode-holder and equipped with a pinion working in 'said rack, said shaft adapted to engage said hooks and serve asja pivot for the electrode-holder, and ineans for securing the electrode-holder in tilted position.

14. In means of the character set iorth, the combination with a furnace-wall, provided with a door-opening, of a door adapted to said opening and provided with an opening through which an electrode may extend, an extension detachably carried by said door and an electrode-holder movably mounted on said extension.

V 15. Iii-means of the, character set forth, the combination within furnace-wall pro vided with a door-opening, of a door adapt- .ed to-- said op'enin: and provided with an opening throughw ich an electrode ma. ex-

tend, an extension detachablil carrie by said door, and an electrodeolder shiftably and tiltably mounted on said extension.

16. In means of the character set forth,

the eombination'with a furnace-wall provided with a door-opening of'a door adaptvided with a door-opening, of a door 'aduptv ed to said-opening and equipped with lnterallv-extending a'rms, a pivot. mounted entire furnace-wall and rigid with said arms, a switch carried by said pivot, an electrodeholder shiftably and tiltably mounted on said door, and a flexible electric conductor between said electrode-holder and said switch.

18. In means of the character set forth, the combination with a furnace-wall provided with a door-opening, of a door adapted to said opening and mounted to be moved to a position removed from the door-opening, means for circulating water through said door, regardless of the position of the door, and anelectrode-holdcr mounted on said door. 19. In means of the character set forth, the combination with a furnace-wall provided with a door-opening, of a door adapted to said opening and mounted to be moved to 'a position removed from the door-opening, means for circulating water throu h said door, regardless of the position of t e door, and an electrode-holder movably mounted on said door. 7

20. In means of the character set forth,

the combination with a furnace-wall pro-' vided with a door-opening, of a'door adapted to said opening, arms formed inte 'ally with the outer surface of saiddoor an rojectin laterally from one edgeof the 001', pivota connections between said arms and the furnace-wall, an extension equipped with a guide and provided with lugs, pins connecting said lugs with said arms at the outer surface of said door, an electrode-holder movably mounted on said guide, and means for shifting said electrode-holder.

21. In means ofthe character set forth,

the combination with a door-opening, of a door adapted to said opening and mounted to be moved to a position removed from the opening, an inclined guide extending outwardly from said door, and an electrodeholder shiftably mounted on saidguide.

22. In means of the character set forth,

to aposition removed from the opening, an-

inclined guide extending outwardly from said door, an electrode-holder shiftably mounted on said guide, a rack associated with said guide, and a pinion mounted on said electrode-holder and meshing. with said rack and equipped with actuating means.

23. In means of the character set forth, the ombination with a furnacewall provided with a door-opening, of a door adapted to said opening and mounted to be moved to a position removed from said openin an inclined guide extending outwardly rom said door, an'electrode-holder mounted on said guide, and means whereby said electrode-holder m. be shifted to the outer end of the gui e and secured thereat in tilted osition with relation to the guide.

24. n means of the character set forth, the combination with a furnace-wall rovided with a door-opening, of a main oor and an auxiliary door adapted to close said opening, said doors having mountings adapting each door to be moved out of the path of the other door and said auxiliary door being equipped with electrode-holding means.

25. In means of the character set forth, the combination with a furnace wall provided with a door-opening, of a. main door adapted to close said opening, a mounting for said door adapted to carry the door to and support itin position above said dooropening, an auxiliary door adapted to close said door-opening, said auxiliary door equipped with electrode-bolt ing means, and a mounting for said auxiliary door adapted to carry the same to and support it in position at one lateral side of, said door opening.

JULIUS R. HALL. 

